<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            background: #26394E;
            height: 100%;
            margin: 0;
            padding: 0;
        }
        .left{
            position: absolute;
            width: 300px;
            height: 100%;
            background: #FED057;
            left: -220px;
        }
        ul{
            margin-top:20px;
            padding: 0;
        }
        li{
            list-style: none;
            color: #ffffff;
            font-size: 18px;
            padding:15px 25px;
        }
    </style>
</head>
<body>
  <div class="left">
      <ul>
          <li>Menue Item</li>
          <li>Menue Item</li>
          <li>Menue Item</li>
          <li>Menue Item</li>
          <li>Menue Item</li>
      </ul>
  </div>

  <script src="js/util.js" type="text/javascript"></script>
  <script>
      var oLeft = document.getElementsByClassName('left')[0];

      oLeft.onmouseover = function () {
          startMove(oLeft,{left:0});
      };
      oLeft.onmouseout = function () {
          startMove(oLeft,{left:-220});
      }

  </script>

</body>
</html>